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<title>class YARP::LanguageServer - yarp: Ruby Standard Library Documentation</title>


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    <li ><a href="#method-c-new">::new</a>
    <li ><a href="#method-i-capabilities">#capabilities</a>
    <li ><a href="#method-i-code_actions">#code_actions</a>
    <li ><a href="#method-i-diagnostics">#diagnostics</a>
    <li ><a href="#method-i-run">#run</a>
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    <main role="main" aria-labelledby="class-YARP::LanguageServer">
    <h1 id="class-YARP::LanguageServer" class="class">
      class YARP::LanguageServer
    </h1>

    <section class="description">
    
<p><a href="../YARP.html"><code>YARP</code></a> additionally ships with a language server conforming to the language server protocol. It can be invoked by running the yarp-lsp bin script (bin/yarp-lsp)</p>

    </section>

      <section id="5Buntitled-5D" class="documentation-section">


      <section class="constants-list">
      <header>
      <h3>Constants</h3>
      </header>
      <dl>
          <dt id="GITHUB_TEMPLATE">GITHUB_TEMPLATE
          <dd>
        </dl>
        </section>

        <section class="attribute-method-details" class="method-section">
        <header>
        <h3>Attributes</h3>
        </header>

          <div id="attribute-i-input" class="method-detail">
            <div class="method-heading attribute-method-heading">
              <span class="method-name">input</span><span
                class="attribute-access-type">[R]</span>
            </div>

            <div class="method-description">
              
              </div>
            </div>
          <div id="attribute-i-output" class="method-detail">
            <div class="method-heading attribute-method-heading">
              <span class="method-name">output</span><span
                class="attribute-access-type">[R]</span>
            </div>

            <div class="method-description">
              
              </div>
            </div>
            </section>


                <section id="public-class-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Class Methods</h3>
                </header>

                  <div id="method-c-new" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">new</span><span
                                class="method-args">( input: $stdin, output: $stdout )</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File yarp/language_server.rb, line 31</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(
  <span class="ruby-value">input:</span> <span class="ruby-identifier">$stdin</span>,
  <span class="ruby-value">output:</span> <span class="ruby-identifier">$stdout</span>
)
  <span class="ruby-ivar">@input</span> = <span class="ruby-identifier">input</span>.<span class="ruby-identifier">binmode</span>
  <span class="ruby-ivar">@output</span> = <span class="ruby-identifier">output</span>.<span class="ruby-identifier">binmode</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Instance Methods</h3>
                </header>

                  <div id="method-i-run" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">run</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>rubocop:disable Layout/LineLength</p>

                              <div class="method-source-code" id="run-source">
            <pre><span class="ruby-comment"># File yarp/language_server.rb, line 40</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">run</span>
  <span class="ruby-identifier">store</span> =
    <span class="ruby-constant">Hash</span>.<span class="ruby-identifier">new</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">hash</span>, <span class="ruby-identifier">uri</span><span class="ruby-operator">|</span>
      <span class="ruby-identifier">filepath</span> = <span class="ruby-constant">CGI</span>.<span class="ruby-identifier">unescape</span>(<span class="ruby-constant">URI</span>.<span class="ruby-identifier">parse</span>(<span class="ruby-identifier">uri</span>).<span class="ruby-identifier">path</span>)
      <span class="ruby-constant">File</span>.<span class="ruby-identifier">exist?</span>(<span class="ruby-identifier">filepath</span>) <span class="ruby-operator">?</span> (<span class="ruby-identifier">hash</span>[<span class="ruby-identifier">uri</span>] = <span class="ruby-constant">File</span>.<span class="ruby-identifier">read</span>(<span class="ruby-identifier">filepath</span>)) <span class="ruby-operator">:</span> <span class="ruby-keyword">nil</span>
    <span class="ruby-keyword">end</span>

  <span class="ruby-keyword">while</span> (<span class="ruby-identifier">headers</span> = <span class="ruby-identifier">input</span>.<span class="ruby-identifier">gets</span>(<span class="ruby-string">&quot;\r\n\r\n&quot;</span>))
    <span class="ruby-identifier">source</span> = <span class="ruby-identifier">input</span>.<span class="ruby-identifier">read</span>(<span class="ruby-identifier">headers</span>[<span class="ruby-regexp">/Content-Length: (\d+)/i</span>, <span class="ruby-value">1</span>].<span class="ruby-identifier">to_i</span>)
    <span class="ruby-identifier">request</span> = <span class="ruby-constant">JSON</span>.<span class="ruby-identifier">parse</span>(<span class="ruby-identifier">source</span>, <span class="ruby-value">symbolize_names:</span> <span class="ruby-keyword">true</span>)

    <span class="ruby-comment"># stree-ignore</span>
    <span class="ruby-keyword">case</span> <span class="ruby-identifier">request</span>
    <span class="ruby-keyword">in</span> { <span class="ruby-value">method:</span> <span class="ruby-string">&quot;initialize&quot;</span>, <span class="ruby-value">id:</span> }
      <span class="ruby-identifier">store</span>.<span class="ruby-identifier">clear</span>
      <span class="ruby-identifier">write</span>(<span class="ruby-value">id:</span> <span class="ruby-identifier">id</span>, <span class="ruby-value">result:</span> { <span class="ruby-value">capabilities:</span> <span class="ruby-identifier">capabilities</span> })
    <span class="ruby-keyword">in</span> { <span class="ruby-value">method:</span> <span class="ruby-string">&quot;initialized&quot;</span> }
      <span class="ruby-comment"># ignored</span>
    <span class="ruby-keyword">in</span> { <span class="ruby-value">method:</span> <span class="ruby-string">&quot;shutdown&quot;</span> } <span class="ruby-comment"># tolerate missing ID to be a good citizen</span>
      <span class="ruby-identifier">store</span>.<span class="ruby-identifier">clear</span>
      <span class="ruby-identifier">write</span>(<span class="ruby-value">id:</span> <span class="ruby-identifier">request</span>[<span class="ruby-value">:id</span>], <span class="ruby-value">result:</span> {})
    <span class="ruby-keyword">in</span> { <span class="ruby-value">method:</span> <span class="ruby-string">&quot;exit&quot;</span>}
      <span class="ruby-keyword">return</span>
    <span class="ruby-keyword">in</span> { <span class="ruby-value">method:</span> <span class="ruby-string">&quot;textDocument/didChange&quot;</span>, <span class="ruby-value">params:</span> { <span class="ruby-value">textDocument:</span> { <span class="ruby-value">uri:</span> }, <span class="ruby-value">contentChanges:</span> [{ <span class="ruby-value">text:</span> }, <span class="ruby-operator">*</span>] } }
      <span class="ruby-identifier">store</span>[<span class="ruby-identifier">uri</span>] = <span class="ruby-identifier">text</span>
    <span class="ruby-keyword">in</span> { <span class="ruby-value">method:</span> <span class="ruby-string">&quot;textDocument/didOpen&quot;</span>, <span class="ruby-value">params:</span> { <span class="ruby-value">textDocument:</span> { <span class="ruby-value">uri:</span>, <span class="ruby-value">text:</span> } } }
      <span class="ruby-identifier">store</span>[<span class="ruby-identifier">uri</span>] = <span class="ruby-identifier">text</span>
    <span class="ruby-keyword">in</span> { <span class="ruby-value">method:</span> <span class="ruby-string">&quot;textDocument/didClose&quot;</span>, <span class="ruby-value">params:</span> { <span class="ruby-value">textDocument:</span> { <span class="ruby-value">uri:</span> } } }
      <span class="ruby-identifier">store</span>.<span class="ruby-identifier">delete</span>(<span class="ruby-identifier">uri</span>)
    <span class="ruby-keyword">in</span> { <span class="ruby-value">method:</span> <span class="ruby-string">&quot;textDocument/diagnostic&quot;</span>, <span class="ruby-value">id:</span>, <span class="ruby-value">params:</span> { <span class="ruby-value">textDocument:</span> { <span class="ruby-value">uri:</span> } } }
      <span class="ruby-identifier">contents</span> = <span class="ruby-identifier">store</span>[<span class="ruby-identifier">uri</span>]
      <span class="ruby-identifier">write</span>(<span class="ruby-value">id:</span> <span class="ruby-identifier">id</span>, <span class="ruby-value">result:</span> <span class="ruby-identifier">contents</span> <span class="ruby-operator">?</span> <span class="ruby-identifier">diagnostics</span>(<span class="ruby-identifier">contents</span>) <span class="ruby-operator">:</span> <span class="ruby-keyword">nil</span>)
    <span class="ruby-keyword">in</span> { <span class="ruby-value">method:</span> <span class="ruby-string">&quot;textDocument/codeAction&quot;</span>, <span class="ruby-value">id:</span>, <span class="ruby-value">params:</span> { <span class="ruby-value">textDocument:</span> { <span class="ruby-value">uri:</span> }, <span class="ruby-value">context:</span> { <span class="ruby-value">diagnostics:</span> }}}
      <span class="ruby-identifier">contents</span> = <span class="ruby-identifier">store</span>[<span class="ruby-identifier">uri</span>]
      <span class="ruby-identifier">write</span>(<span class="ruby-value">id:</span> <span class="ruby-identifier">id</span>, <span class="ruby-value">result:</span> <span class="ruby-identifier">contents</span> <span class="ruby-operator">?</span> <span class="ruby-identifier">code_actions</span>(<span class="ruby-identifier">contents</span>, <span class="ruby-identifier">diagnostics</span>) <span class="ruby-operator">:</span> <span class="ruby-keyword">nil</span>)
    <span class="ruby-keyword">in</span> { <span class="ruby-value">method:</span> <span class="ruby-regexp">%r{\$/.+}</span> }
      <span class="ruby-comment"># ignored</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="private-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Private Instance Methods</h3>
                </header>

                  <div id="method-i-capabilities" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">capabilities</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>rubocop:enable Layout/LineLength</p>

                              <div class="method-source-code" id="capabilities-source">
            <pre><span class="ruby-comment"># File yarp/language_server.rb, line 84</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">capabilities</span>
  {
    <span class="ruby-value">codeActionProvider:</span> {
      <span class="ruby-value">codeActionKinds:</span> [
        <span class="ruby-string">&#39;quickfix&#39;</span>,
      ],
    },
    <span class="ruby-value">diagnosticProvider:</span> {
      <span class="ruby-value">interFileDependencies:</span> <span class="ruby-keyword">false</span>,
      <span class="ruby-value">workspaceDiagnostics:</span> <span class="ruby-keyword">false</span>,
    },
    <span class="ruby-value">textDocumentSync:</span> {
      <span class="ruby-value">change:</span> <span class="ruby-value">1</span>,
      <span class="ruby-value">openClose:</span> <span class="ruby-keyword">true</span>
    },
  }
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-code_actions" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">code_actions</span><span
                                class="method-args">(source, diagnostics)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="code_actions-source">
            <pre><span class="ruby-comment"># File yarp/language_server.rb, line 102</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">code_actions</span>(<span class="ruby-identifier">source</span>, <span class="ruby-identifier">diagnostics</span>)
  <span class="ruby-identifier">diagnostics</span>.<span class="ruby-identifier">map</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">diagnostic</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">message</span> = <span class="ruby-identifier">diagnostic</span>[<span class="ruby-value">:message</span>]
    <span class="ruby-identifier">issue_content</span> = <span class="ruby-constant">URI</span>.<span class="ruby-identifier">encode_www_form_component</span>(<span class="ruby-constant">GITHUB_TEMPLATE</span> <span class="ruby-operator">%</span> {<span class="ruby-value">error:</span> <span class="ruby-identifier">message</span>})
    <span class="ruby-identifier">issue_link</span> = <span class="ruby-node">&quot;https://github.com/ruby/yarp/issues/new?&amp;labels=Bug&amp;body=#{issue_content}&quot;</span>

    {
      <span class="ruby-value">title:</span> <span class="ruby-node">&quot;Report incorrect error: `#{diagnostic[:message]}`&quot;</span>,
      <span class="ruby-value">kind:</span> <span class="ruby-string">&quot;quickfix&quot;</span>,
      <span class="ruby-value">diagnostics:</span> [<span class="ruby-identifier">diagnostic</span>],
      <span class="ruby-value">command:</span> {
        <span class="ruby-value">title:</span> <span class="ruby-string">&quot;Report incorrect error&quot;</span>,
        <span class="ruby-value">command:</span> <span class="ruby-string">&quot;vscode.open&quot;</span>,
        <span class="ruby-value">arguments:</span> [<span class="ruby-identifier">issue_link</span>]
      }
    }
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-diagnostics" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">diagnostics</span><span
                                class="method-args">(source)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="diagnostics-source">
            <pre><span class="ruby-comment"># File yarp/language_server.rb, line 121</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">diagnostics</span>(<span class="ruby-identifier">source</span>)
  <span class="ruby-identifier">offsets</span> = <span class="ruby-constant">Hash</span>.<span class="ruby-identifier">new</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">hash</span>, <span class="ruby-identifier">key</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">slice</span> = <span class="ruby-identifier">source</span>.<span class="ruby-identifier">byteslice</span>(<span class="ruby-operator">...</span><span class="ruby-identifier">key</span>)
    <span class="ruby-identifier">lineno</span> = <span class="ruby-identifier">slice</span>.<span class="ruby-identifier">count</span>(<span class="ruby-string">&quot;\n&quot;</span>)

    <span class="ruby-identifier">char</span> = <span class="ruby-identifier">slice</span>.<span class="ruby-identifier">length</span>
    <span class="ruby-identifier">newline</span> = <span class="ruby-identifier">source</span>.<span class="ruby-identifier">rindex</span>(<span class="ruby-string">&quot;\n&quot;</span>, [<span class="ruby-identifier">char</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span>, <span class="ruby-value">0</span>].<span class="ruby-identifier">max</span>) <span class="ruby-operator">||</span> <span class="ruby-value">-1</span>
    <span class="ruby-identifier">hash</span>[<span class="ruby-identifier">key</span>] = { <span class="ruby-value">line:</span> <span class="ruby-identifier">lineno</span>, <span class="ruby-value">character:</span> <span class="ruby-identifier">char</span> <span class="ruby-operator">-</span> <span class="ruby-identifier">newline</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span> }
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">parse_output</span> = <span class="ruby-constant">YARP</span>.<span class="ruby-identifier">parse</span>(<span class="ruby-identifier">source</span>)

  {
    <span class="ruby-value">kind:</span> <span class="ruby-string">&quot;full&quot;</span>,
    <span class="ruby-value">items:</span> [
      <span class="ruby-operator">*</span><span class="ruby-identifier">parse_output</span>.<span class="ruby-identifier">errors</span>.<span class="ruby-identifier">map</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">error</span><span class="ruby-operator">|</span>
        {
          <span class="ruby-value">range:</span> {
            <span class="ruby-value">start:</span> <span class="ruby-identifier">offsets</span>[<span class="ruby-identifier">error</span>.<span class="ruby-identifier">location</span>.<span class="ruby-identifier">start_offset</span>],
            <span class="ruby-value">end:</span> <span class="ruby-identifier">offsets</span>[<span class="ruby-identifier">error</span>.<span class="ruby-identifier">location</span>.<span class="ruby-identifier">end_offset</span>],
          },
          <span class="ruby-value">message:</span> <span class="ruby-identifier">error</span>.<span class="ruby-identifier">message</span>,
          <span class="ruby-value">severity:</span> <span class="ruby-value">1</span>,
        }
      <span class="ruby-keyword">end</span>,
      <span class="ruby-operator">*</span><span class="ruby-identifier">parse_output</span>.<span class="ruby-identifier">warnings</span>.<span class="ruby-identifier">map</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">warning</span><span class="ruby-operator">|</span>
        {
          <span class="ruby-value">range:</span> {
            <span class="ruby-value">start:</span> <span class="ruby-identifier">offsets</span>[<span class="ruby-identifier">warning</span>.<span class="ruby-identifier">location</span>.<span class="ruby-identifier">start_offset</span>],
            <span class="ruby-value">end:</span> <span class="ruby-identifier">offsets</span>[<span class="ruby-identifier">warning</span>.<span class="ruby-identifier">location</span>.<span class="ruby-identifier">end_offset</span>],
          },
          <span class="ruby-value">message:</span> <span class="ruby-identifier">warning</span>.<span class="ruby-identifier">message</span>,
          <span class="ruby-value">severity:</span> <span class="ruby-value">2</span>,
        }
      <span class="ruby-keyword">end</span>,
    ]
  }
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-write" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">write</span><span
                                class="method-args">(value)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="write-source">
            <pre><span class="ruby-comment"># File yarp/language_server.rb, line 160</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">write</span>(<span class="ruby-identifier">value</span>)
  <span class="ruby-identifier">response</span> = <span class="ruby-identifier">value</span>.<span class="ruby-identifier">merge</span>(<span class="ruby-value">jsonrpc:</span> <span class="ruby-string">&quot;2.0&quot;</span>).<span class="ruby-identifier">to_json</span>
  <span class="ruby-identifier">output</span>.<span class="ruby-identifier">print</span>(<span class="ruby-node">&quot;Content-Length: #{response.bytesize}\r\n\r\n#{response}&quot;</span>)
  <span class="ruby-identifier">output</span>.<span class="ruby-identifier">flush</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

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